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Sphygmograph, London, England, 1900-1910

Gibson’s Clinical Polygraph was a more complex variation on the standard sphygmograph. A sphygmograph displays the pulse beat visually by recording the movement of the pulse on paper. Gibson’s Clinical Polygraph is powered by a clockwork mechanism. It let a physician simultaneously record the so-called apex beat (the actual rate of heart beat) with their respiration rate (the number of breaths the…